Transfer derrick



Sept. 3, 1940. E. WONSYLD TRANSFER DERRICK Filed Oct. 24, 1939 2 Sheets-Sheet l INJENTOR EDWARD Wows v1.0

ATTORNEY P 1940. E. woNsYLD I 2,213,540

TRANSFER DERRICK Filed Oct. 24, 1939 2 Sheets-Sheet 2 INVENTOR EDWARD W0 NS YLD O QQZ ATTORN EY Patented Sept. 3, 1940 TE, STAT S,-

4 Claims.

This invention relates to a boom derrick for picking up a load at one point and swinging it laterally to another point, such as picking up a log and putting it on a railway car or a truck.

The boom derrick, comprising a mast with a boom, usually pivotally mounted on the mast itself near its base, is old. Such hoisting apparatus connotes gear forswinging the load after it is lifted, usually a hoisting drum independently operable with often a third drum for swinging the boom back to pick up position.

An object of the present invention is a' derrick that will handle the heaviest loads, within its designed capacity, with a two drum hoist and wherein the weight of the load acts as the motive power to swing from pick-up to dropping position, with the return of the unloaded boom only being necessary by power.

This and other objects that will be apparent to those skilled in the art will appear from the following description, the novel structures and combinations of structures to accomplish the objects being particularly pointed out in the claims.

Drawings accompany and serve as a part of the disclosure hereof, being of that kind of derrick, according to the present invention, that is particularly adapted to logging operations.

In the drawings- Fig. I is a side view in elevation of the embodiment selected to illustrate the principle of the present invention; 7

Fig. II is a front view, in elevation of the structure shown in Fig. I; and

Fig. III is a top or plan view of Fig. I.

The drawings are described in detail as follows:

I is a base member, which designation includes the parts indicated by la, lb, lo and le. 2 is a mast which will usually be equipped with 'guy lines attached to the top but which are not shown.-

it shall always be somewhat ahead of a trans-' verse line drawn through the base of the mast such as the axial line. of the element le.

It will be seenat once that a line from the load to the top of the mast, projected, such as the line 5, dotted, in Fig. III, must fall inside the pivot 4, as shown in this figure. or the load will tend to swing inthe wrong direction instead of in the direction of the arrow as shown in this figure. It is also seen that moving the pivot nearer to the element le will change this characteristic.

The drawings are diagrammatic especially with respect to the length of the boom which will ordinarily be longer in proportion to the boom 3 and the'forward'projection of the base I.

A hoisting line I is operatively threaded through suitable supports such as the sheaves 8 and 9, respectively at the top of the mast land at the outer end of the boom 3, as shown in Fig. Ill. This line is made effectively operative by the hoisting drum Ill. The stay line l4 ties the outer end of the boom 3 to the top of the mast 2.

A return line I I is made operative by the hoisting drum l2 and serves equally well to return the boom to pick up position as shown in Fig. III to snub the boomto the proper point where the load 20 is dropped. Both drums H and I2 will be equipped with power means for winding and with brakes for control as is customary. The lines 1 and l l are live lines in the terminology used in the art.

I have therefore made a derrick that will have every advantage. of one equipped with three drum hoisting machines besides being much easier'to handle since when the load is lifted the line ll is always a tight line.

Having fully disclosed my invention and the principles involved in its operation so that those skilled in the hoisting art can make and use it, what I claim as new and desire to secure by Letters Patent, 'is- 1. A derrick of the mast and boom type, comprising a base member, a mast mounted thereon, a boom heel pivoted to the base at a point at one side of the bottom of the mast, a stay means from the upper portion of the mast tothe outer end of the boom and a hoisting line operatively' threaded through the upper end of the mast and the outerend of the boom and means for selectively pivoting the heel of the boom laterally on either side of the base of the mast whereby the r swinging tendency of the boom is reversible.

2. A loading derrick comprising a mast, a base upon which the mast is erected, a boom pivoted to the base diagonally ahead of the bottom of the mast, a live hoisting line through the top of the mast and the outer end of the boom, a stay line from the top of the mast to the outer end of V the boom and a live return line on the outside 0i"v the boom, whereby the load line tends to lift a load to the boom andswing it across the front of the mast and the return line controls the swinging tendency.

3. A loading derrick, comprising a base, a vertical mast on said base, a boom heel-pivoted on said base diagonally ahead of the bottom of the mast, a stay line from the top of the mast to the outerend of the boom that supports it at an acute angle with the base, a live load line through the top of the mast and the upper end of the boom angularly to the axis of the boom and a controllable livereturn line arranged angularly to the axis of the boom on the opposite side thereof that controls the tendency of the load line to swing a lifted load.

4. The combination as claimed in claim 3 and including a heel mounting for the boom spaced diagonally from the bottom of the mast opposite-l 5 EDWARD WONSYL'D. 

